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송정한(J.H. Song),이혜진(H.J. Lee),이낙규(N.K. Lee),이근안(G.A Lee),이형욱(H.W. Lee) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4
본 연구에서는 , 1.0 inch HDD 요소부품의 체결에 사용되는 직경 800 um에 200um의 피치를 갖는 마이크로 스크류의 성형을 위하여 전조공정에 대한 유한요소 해석을 통하여 공정분석을 수행하였으며, 실제 설계 가이드라인과 형상비교를 통하여 성형가능성을 검토하였다. 그 결과 유한요소 해석을 통하여 얻은 스크류의 형상이 JIS 기준에 만족하는 것으로 나타났으며 이를 통하여 1.0 inch HDD 체결용 마이크로 스크류의 성형이 가능함을 확인할 수 있었다.
마이크로 헤링본 패턴 점진성형공정의 해석 및 실험적 연구
송정한(J. H. Song),이혜진(H. J. Lee),박진호(J. Park),이율(Y. Lee),최석우(S. Choi),이형욱(H. W. LEe) 한국소성가공학회 2012 한국소성가공학회 학술대회 논문집 Vol.2012 No.5
In this paper, the forming process for the herringbone pattern is conducted through a finite element simulation and experimental verification. The investigated parameters from the analysis are the variation of groove depth, forming load, and amount of the elastic recovery in elasto-plastic micro forming. Analysis result demonstrates that the groove was uniformly shaped with depth of 3㎛ considering the elastic recovery except the tip area. The simulation result is coinciding with experimental one. This result reveals that the incremental forming can be utilized to make the herringbone pattern on the bearing shaft.
Cyclic Oxidation Behavior of Thermal Barrier Coatings Irradiated by High-intensity Pulsed Ion Beam
J. I. Song(송정일),Y. Q. Wang(왕일기),Y. G. Kwun(권용구),W. K. JOO(주원경) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
High-temperature oxidation resistance of 7 wt. % Y₂O₃-ZrO₂ thermal barrier coatings (TBCs) irradiated by high-intensity pulsed ion beam (HIPIB) has been investigated in a cyclic oxidation condition at 1050 ℃×1 h. The characteristics of the columnar grains disappeared after HIPIB irradiation at the ion current densities of 100-200 A/㎠, and the irradiated surface presented a smoothed, densified feature after the remelting and ablation due to the HIPIB irradiation. The cross-sectional morphologies of HIPIB-irradiated TBCs show less oxidation of the NiCoCrAlY bonding layer, with a thinner thermally grown oxide (TGO) layer. The morphology observation is consistent with the results of cyclic oxidation test. It is found that the inward diffusion of oxygen through TBCs can be significantly impeded by the desified top layer by the HIPIB irradiation, thus limiting the oxidation of the bonding layer, improving the overall oxidation resistance of the irradiated TBCs.